
pub mod dir {
    use std::fs;
    pub fn new_dir() -> std::io::Result<()> {
        fs::create_dir("data")?;
        Ok(())
    }

    pub fn write_file(file_name: String, ext: String, ) -> std::io::Result<()> {
        fs::write("foo.txt", b"Lorem ipsum")?;
        Ok(())
    }
}